Advertisement feature for NB1 · Our method
How the four gut-health approaches were scored
The review assessed each option using the same five criteria, then compared the scores, pros, cons and overall verdicts.
The five criteria
The same five questions were applied to NB1, Symprove, multi-strain blends and generic prebiotic or fibre supplements.
Starting-point specificity
Whether the approach starts with information about an individual gut or uses one fixed population-level formula.
Personalisation
Whether biological data changes the product itself, rather than only changing a recommendation.
Feedback mechanism
Whether retesting or another built-in measure can show a before-and-after.
Scientific backing
The relevance of published evidence and expert oversight behind the approach.
Cost and accessibility
Monthly price, waiting time, availability and commitment.
What the review is based on
Current NB1 and Symprove specifications, prices and plan mechanics were checked against their manufacturer information. The two generic category entries vary by brand and retailer, so no exact current price is stated for them.
This was not a head-to-head clinical trial. The scores are editorial ratings, not clinical measurements.
Where NB1 scored highest
NB1 received the highest scores for personalisation, the way it uses an individual gut sample before creating a formula, and the availability of retesting. It scored lowest on cost and accessibility and placed behind Symprove on published independent evidence.
NB1 led on personalisation and feedback. Fixed products cost less and can be started immediately.